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Currently supporting CP/M 2.2 and CP/M 3.0

This ia a fork of Takashi TOYOSHIMA's CP/Mega88 project (https://github.com/toyoshim/cp-mega88 ), only focussing on the AVR implementation.

The project features an Intel 8080 emulator, running in an ATmega88 AVR, in a virtual machine which runs CP/M 2.2 and 3.0. (dual boot)

This is a work in progress. Although the system is functional, it is not yet finished. Inside you will find all the files you need to build the system

CP-Mega88

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Currently supporting: CP/M 2.2, Dos+ 2.5, ZSDOS 1.1/ZCPR 2, CP/M 3, ZPM3 and NASCOM “ROM” BASIC 4.7


In march 2007 Grant Searle introduced “CP/M on Breadboard”, a 9 chip Z80 CP/M computer using a CF card as mass storage device.

(http://searle.hostei.com/grant/ )


I got inspired by his work and created my own version

SBC-2G-512k

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Currently supporting: CP/M 2.2, Dos+ 2.5, ZSDOS 1.1 / ZCPR 2, MP/M, CP/M 3, ZPM3 and NASCOM “ROM” BASIC 4.7


An FPGA implementation of the earlier mentioned Z80 system. Because the configuration supports a 50 Hz interrupt signal, MP/MII was added to the set of supported operating systems.

The system is laid out to run on Altera Cyclone II (EP2C5) miniboard

The board shown is a compact version of a CycloneII-c board with added serial interface connectors (4 in total) and 5v keyboard interface

MC-2G-1024k
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In answer to popular demand: yes it works on a Cyclone IV too
These are the VHDLs I use,

Cyclone IV.zip

I use the version 130 Quartus software

My miniboard is fitted with a 50 MHz oscillator

The board shown is compact version of James Moxham's work with 4 serial interface connectors and a 5v keyboard interface
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On Serial - USB interfaces

Following the FTDI 232 soap I found the following units based on the CP2102 chip to be cheaper and better. It is a 3v3 unit with voltage converter built in, but the inputs are 5v tolerant. A 5v Z80 SIO has no trouble with the 3v3 outputs. All necessary modem lines are available. There is also a 500 mA polyfuse in the 5V line

The board turns into a neat USB plug using a length of heat shrink tube.

look on eBay. They cost about $1.25 each


builderpages/rhkoolstar/start.txt · Last modified: 2017/09/17 11:22 by rhkoolstar
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